[NF] Test if equation with impure condition.

Belonging to [master]:
  - #150
  - OpenModelica/OMCompiler#3060

testsuite/flattening/modelica/scodeinst/IfEquationImpure1.mo

@@ -0,0 +1,35 @@
+// name: IfEquationImpure1
+// keywords:
+// status: correct
+// cflags: -d=newInst
+//
+
+model IfEquationImpure1
+  Real x = time;
+  Real y;
+  parameter Boolean cond = false;
+equation
+  when Clock() then
+    if sample(cond) then
+      y = sample(x);
+    else
+      y = 0;
+    end if;
+  end when;
+end IfEquationImpure1;
+
+// Result:
+// class IfEquationImpure1
+//   Real x = time;
+//   Real y;
+//   parameter Boolean cond = false;
+// equation
+//   when Clock() then
+//     if sample(cond, Clock()) then
+//       y = sample(x, Clock());
+//     else
+//       y = 0.0;
+//     end if;
+//   end when;
+// end IfEquationImpure1;
+// endResult

testsuite/flattening/modelica/scodeinst/Makefile

@@ -533,6 +533,7 @@ IfEquation7.mo \
 IfEquationEval1.mo \
 IfEquationEval2.mo \
 IfEquationEval3.mo \
+IfEquationImpure1.mo \
 IfExpression1.mo \
 IfExpression2.mo \
 IfExpression3.mo \